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ER modeling, normalization, SQL and transactions for database systems courses. Designs that make sense and queries that return the right rows.

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What we cover

Every part of database your course covers.

Modeling

  • ER and EER diagrams
  • Relational mapping
  • Normalization (1NF–BCNF)
  • Functional dependencies

Querying

  • SQL joins and aggregates
  • Relational algebra
  • Views and subqueries
  • Query optimization

Internals

  • B+ trees and indexing
  • Transactions and ACID
  • Concurrency control
  • Recovery and logging

NoSQL

  • MongoDB documents
  • Redis
  • NoSQL schema design
  • When to choose NoSQL
Example order

One database order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief
Intro to Database SystemsUndergradDue in 5 days

Normalize an enrollment schema to BCNF

Given one wide Enrollment table, find the functional dependencies, decompose to BCNF, show the decomposition is lossless and write the DDL with keys and constraints.

Requirements
  • List all functional dependencies
  • Step-by-step BCNF decomposition
  • Lossless-join argument
  • PostgreSQL DDL with keys
02The solution
schema.sql18 lines
1-- BCNF decomposition of Enrollment(sid, sname, cid, title, dept, grade)
2CREATE TABLE student (
3 sid INT PRIMARY KEY,
4 sname TEXT NOT NULL
5);
6
7CREATE TABLE course (
8 cid TEXT PRIMARY KEY,
9 title TEXT NOT NULL,
10 dept TEXT NOT NULL
11);
12
13CREATE TABLE enrollment (
14 sid INT REFERENCES student(sid),
15 cid TEXT REFERENCES course(cid),
16 grade CHAR(2) CHECK (grade IN ('A','B','C','D','F','W')),
17 PRIMARY KEY (sid, cid)
18);
DDL runs on PostgreSQL 15 · 0 errors
03The explanation doc
explanation.pdf
1.
The dependencies
sid → sname, cid → title, dept and (sid, cid) → grade. The key is {sid, cid}.
2.
BCNF violations
sid → sname and cid → title, dept have left sides that aren’t superkeys, so each is split out.
3.
Lossless join
Each split shares a key with the remaining table, so joining them back loses nothing.
04The price
AI predicted budget
$60–$120
Level · UndergradIncluded
Deadline · 5 daysStandard
Shown before any contact details were shared.
Final price from our team
$85
Delivered 6h early
How it works

From upload to predicted budget in under a minute.

The AI does one job: it predicts your price. A person on our team reviews your files and sets the final number.

  1. 01
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    Upload your files

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  2. 02
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    The AI asks what’s missing

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  3. 03
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  4. 04
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    Our team confirms the final price

    Leave your email. A senior engineer reviews your files and sends the final price.

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Typical orders

Common database assignments and typical budgets.

ER diagram and relational mapping
$60–$140
Usually 2–3 days
typical range
Normalization problem set
$50–$120
Usually 1–2 days
typical range
Transactions and concurrency
$60–$140
Usually 2–3 days
typical range
Full database application
$200–$450
Usually 5–8 days
typical range

Your budget depends on your files, deadline and level. Upload them for your own prediction.

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